On April 14, 1934, the Phillies entered into an affiliation agreement with the New York–Penn League Hazelton Mountaineers. This was the first minor league affiliation for the Phillies.
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1963 to the present
The Philadelphia Phillies maintained eight minor league affiliates as of 2010. This list compiles the history of their minor league affiliates since the re-organization of the Minor League classification season prior to the 1963 season.
1962 and prior years
Prior to the 1963 season, organized baseball reclassified its minor league system. The classification of leagues as B, C, D, and E changed to the current A-based rankings: AAA, AA, A, short-season A, and Rookie-Advanced. Many leagues were reclassified. Class D-Day would be equivalent to the Rookie level today.
The Eastern League and Southern League moved up to AA; the Carolina League changed from B to A; the Northern League and California League moved from C to A; the Florida State League, Midwest League, Western Carolinas League (later renamed the South Atlantic League), and the Georgia–Florida League all moved from D to A. The New York–Penn League became an A (short-season) league, having previously been a D League. The other short-season A league, the Northwest League, had been a B league. The new Rookie-Advanced class was filled by the formerly C Pioneer League and D Appalachian League.